BA 387 then BA 668 at Heathrow
Brussels → London → Marrakesh
Timetable, London time
10:00BA 387 from Brussels at the gate
07:45BA 668 to Marrakesh leaves the gate
21 h 45 apart on the timetable, overnight
BA 668 leaves 21 h 45 after BA 387 arrives on the timetable: more than half a day, so not a connection we count.